package homework.api05.exercise01;

import java.io.*;

public class CopyDemo3 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("img.png");
        BufferedInputStream bis = new BufferedInputStream(fis);
        FileOutputStream fos = new FileOutputStream("img.png");
        BufferedOutputStream bos = new BufferedOutputStream(fos);

        long start = System.currentTimeMillis();
        int d;
        while ((d=bis.read())!=-1){
            bos.write(d);
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕,耗时"+(start-end));

        bis.close();//关闭高级流时,顺便将低级流关闭了
        bos.close();


    }
}


